20 Best Anime series like Haganai: I Don't Have Many Friends (2011)

Ren Amamiya is about to enter his second year after transferring to Shujin Academy in Tokyo. Following a particular incident, his Persona awakens, and together with his friends, they form the “Phantom Thieves of Hearts” to reform hearts of corrupt adults by stealing the source of their distorted desires. Meanwhile, bizarre and inexplicable crimes have been popping up one after another… Living an ordinary high school life in Tokyo during the day, the group maneuvers the metropolitan city as Phantom Thieves after hours. Let the curtain rise for this grand, picaresque story!

After discovering that they work at the same company, a gaming crazed otaku and a fujoshi reunite for the first time since middle school. After some post-work drinking sessions they begin dating, but will it be a perfect relationship for the two?

In an alternate universe, shy, awkward Yuki Nagato attempts to court her crush, Kyon, with the help of her best friend and neighbor, the perky and indomitable Ryoko Asakura. Together, the trio defends their high school literature club from extermination…and from the pestering of their over-the-top classmate Tsuruya and her friend and minion Mikuru.

In the early 2050s, unknown life forms called “Oracle cells” begin their uncontrolled consumption of all life on Earth. Their ravenous appetite and remarkable adaptability earn them first dread, then awe, and finally the name “aragami”. In the face of an enemy completely immune to conventional weapons, urban civilization collapses, and each day humanity is driven further and further toward extinction. One single ray of hope remains for humanity. Following the development of “God Arcs”—living weapons which incorporate Oracle cells—their wielders are organized into an elite force.

When the world is struck by a deadly pandemic that turns humans into zombies, Takashi Komuro and several of his classmates at Fujimi High School try to survive the apocalypse.

Akira is a normal high school boy, but he nevertheless impulsively licks some drool left by the mysterious transfer student Mikoto. The next day he falls asleep with an inexplicable fever. After five days Mikoto suddenly comes to visit, and makes him consume her drool. The fever instantly vanishes, and Mikoto explains that he's suffering from "love sickness." She can transmit emotions through her drool, and the two of them are now bound together.

Mizutani Shizuku finds peace in her studies.  Working hard to stay at the top of the class, alone but focused.  When she is tasked with delivering class materials to Yoshida Haru, her world starts to rapidly expand.  With some new friends and feelings, will she be able to stay focused on her studies?

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Frustrated with her thankless office job, Retsuko the Red Panda copes with her daily struggles by belting out death metal karaoke after work.

Based on the four-panel comic strip that follows the lives of a group of high school students, this animated short features a compilation of comedic vignettes during a typical day in class. The girls compare their test results, child prodigy Chiyo demonstrates her inability to perform tongue-twisters. The stoic Sakaki broods over her earlier encounter with Kamineko, a cat which delights in biting her hand, and daydreamer Osaka imagines what would happen if Chiyo lost her pigtails.

2150 A.D. The battle with the Festum, the silicon life-forms from distant outer space, had reached a new dimension. The North Polar Meir that was crushed during the First Azure Operation had dispersed its fragments all over the world. They all started activity on their own as independent Meirs. Most of the Meirs harbored hatred towards humanity and challenged a fight, however, a portion of the Festum chose coexistence with mankind. Amongst the crossfire, the Ryugujima island alone disappeared from the forefront of battle and continued its silence. The island had gained a means to converse with the Meir since their encounter with Misao Kurusu two years ago. The children of ALVISS had been searching for a way to understand the enemy as they prepared for battle. And now, once again, further evolution was about to befall the island. A girl that understands the language of the Festum, and a girl protected by a Festum. When the two meet, the doors to a new universe opens.

Tomie Kawakami is a femme fatale with long black hair and a beauty mark just under her left eye. She can seduce nearly any man, and drive them to murder as well, even though the victim is often Tomie herself. While one lover seeks to keep her for himself, another grows terrified of the immortal succubus. But soon they realize no matter how many times they kill her, the world will never be free of Tomie.

Fashionable Yuzu imagined the first day at her new school she transferred to after her mother's remarriage a bit differently; she didn't know it'd be an ultra-strict and conservative girls' school. So instead of a sweet high-school romance, she butts heads with the stern student council president Mei—who turns out to be her new step sister. And she has to learn that hate and attraction are often not that far apart.

Bananya is a series about the secret life of kitties who live in bananas.

In a world powered by advanced technology, crime and action unfold in the archipelagic nation of Cremona. Genius investigator Keith Flick rejoins the royal police force just as serial killer "B" emerges. Mysterious youth Koku may be an ally, or a target.

At the end of the last summer vacation of high school, Youta Narukami spends his days preparing for the university entrance exams, when a young girl named Hina suddenly appears, proclaiming herself as the "god of omniscience." Youta is confused and does not believe Hina when she tells him "The world will end in 30 days." After witnessing Hina’s God-like predictive ability, Youta begins to believe her powers are real. Hina, who is innocent and childlike despite her supernatural powers, decides for some reason to stay at Youta’s home. Thus begins the start of their lively summer before the end of the world.

Chihayafuru is  about a school girl, Chihaya Ayase, who is inspired by a new classmate to take up Hyakunin Isshu karuta competitively.

One night, Kyouhei and Hibino discover a dead body and coincidentally Kyouhei’s sister appears with the doll called Kamisama she controls.

In the mysterious future, crystalline organisms called Gems inhabit a world that has been destroyed by six meteors. Each Gem is assigned a role in order to fight against the Lunarians, a species who attacks them in order to shatter their bodies and use them as decorations.Phosphophyllite, also known as Phos, is a young and fragile Gem who dreams of helping their friends in the war effort. Instead, they are told to compile an encyclopedia because of their delicate condition. After begrudgingly embarking on this task, Phos meets Cinnabar, an intelligent gem who has been relegated to patrolling the isolated island at night because of the corrosive poison their body creates. After seeing how unhappy Cinnabar is, Phos decides to find a role that both of the rejected Gems can enjoy. Can Phos's seemingly mundane assignment lead both Phos and Cinnabar to the fulfillment they desire?

X-Men, still grieving over the death of Phoenix (Jean Grey), are investigating a case of a missing mutant girl in Northern Japan. This leads them to a mysterious virus that turns mutants into monsters. U-Men and the Inner Circle want it.

Yuuto Suoh gets more than he bargained for when he joins his childhood friend Mitsuki Shimoya in testing out an urban legend. When he uses his phone to take a picture of himself with the local shrine's divine mirror, he is whisked off into another world – one heavily steeped in the lore of the old Norse myths. Using his knowledge gained from school and from his solar-powered smartphone, he has the chance to bring the Wolf Clan, the same people who cared for him, to prominence, all while earning the adoration of a group of magic-wielding warrior maidens known as the Einherjar.

A mysterious switch appeared one day. Upon pressing it, they were sent to a different alternative world!! There are also characters from other alternative worlds gathered together...!?

A “small” new student, Ushio Hinomaru, appears before the weak little sumo club of Oodachi High School! The words “big” and “heavy” are the rules to this sport, which does not fit this newbie any inch, but this guy goes and does what...!? Ushio and the small sumo club climbs its way to the top! The goal is Hinoshita Kaisan, a title for the highest rank in professional sumo, equivalent of Yokozuna.

There is an urban legend that tells of a shinigami that can release people from the pain they are suffering. This "Angel of Death" has a name—Boogiepop. And the legends are true. Boogiepop is real. When a rash of disappearances involving female students breaks out at Shinyo Academy, the police and faculty assume they just have a bunch of runaways on their hands. Yet some students know better. Something mysterious and foul is afoot. Is it Boogiepop or something even more sinister...?

Since the Edo periods of Japan, gladiator arenas exist in certain areas. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where winner takes all. Toki Taouma, nicknamed "Ashura," joins these arenas and devastates his opponents. His spectacular ability to crush his enemies catches the attention of the big business owners, including the Nogi Group chairman, Nogi Hideki.

There is a tower that summons chosen people called "Regulars" with the promise of granting their deepest desires. Whether it be wealth, fame, authority, or something that surpasses them all—everything awaits those who reach the top.Twenty-Fifth Bam is a boy who had only known a dark cave, a dirty cloth, and an unreachable light his entire life. So when a girl named Rachel came to him through the light, his entire world changed. Becoming close friends with Rachel, he learned various things about the outside world from her. But when Rachel says she must leave him to climb the Tower, his world shatters around him. Vowing to follow after her no matter what it takes, he sets his sight on the tower, and a miracle occurs.Thus begins the journey of Bam, a young boy who was not chosen by the Tower but opened its gates by himself. They call his kind "Irregulars"—beings that have shaken the very foundation of the Tower each time they set foot inside it.